For May day and Easter Sunday are the idealization of springtime, of the resurrection of nature, the time of the year when the rays of the sun become warm enough to tear the cloud-veils to shreds, pump the sap back up to the bursting ends of the twigs and make the blood of men course quicker in their veins. As far back as human history goes, this period of enhanced vitality has always been the signal of a deeper altruism within the class and a stronger impulse to fight outside the class.